Import LinuxCNC source tree

tests/halcompile/command_line_flags/flags.c

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+/*
+  flags.c
+  To test command line compiler flags to halcompile
+
+  Copyright (C) 2023 Andy Pugh
+ */
+
+
+#ifndef ULAPI
+#error This is intended as a userspace component only.
+#endif
+
+#include <stdio.h>
+#include <readline.h>
+
+int main(int argc, char **argv)
+{
+    const char* res;
+    rl_initialize();
+    return 0;
+}